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Thermodynamic QED Coherence in Condensed Matter: Microscopic Basis of Thermal Superradiance
S. Sivasubramanian, A. Widom, Y. N. Srivastava
Electromagnetic superradiant field coherence exists in a condensed matter system if the electromagnetic field oscillators undergo a mean displacement. Transitions into thermal stat…
Thermal Superradiance and the Clausius-Mossotti Lorentz-Lorenz Equations
S. Sivasubramanian, A. Widom, Y. N. Srivastava
Electric polarization phenomena in insulating systems have long been described in mean field theory by the (static) Clausius-Mossotti or (dynamic) Lorentz-Lorenz polarizabilities.…
Radiation Induced Landau-Lifshitz-Gilbert Damping in Ferromagnets
S. Sivasubramanian, A. Widom, Y. N. Srivastava
The Landau-Lifshitz-Gilbert damping coefficient employed in the analysis of spin wave ferromagnetic resonance is related to the electrical conductivity of the sample. The changing…
Landau-Khalatnikov Circuit model for Ferroelectric Hysteresis
S. Sivasubramanian, A. Widom
We present the circuit equivalent of the Landau-Khalatnikov dynamical ferroelectric model. The differential equation for hysteretic behavior is subject to numerical computer simula…
Gauge Invariant Formulations of Dicke-Preparata Super-Radiant Models
S. Somu, A. Widom, Y. N. Srivastava
In a gauge invariant formulation of the molecular electric dipole-photon interaction, the rigorous coupling is strictly linear in the photon creation and photon annihilation operat…
Rotating Atomic Traps for Bosons and the Centrifuge Effect
T. Majmudar, A. Widom
A rigorous time independent Hamiltonian for rotating atomic traps is discussed. The steady states carry a mass current and thereby an angular momentum. It is shown that the rotatio…